sql - 如何删除两个表中的公共字段

Question

我有两个表，表 1 和表 2。

表 1 的字段是： book,pen,pencil,bag

表 2 的字段是： car,van,book,bike,pencil

当我运行查询时，我希望查询忽略重复或公共字段并返回另一个字段。

输出应如下所示，

car,van,bike,pen,bag

Answer 1

也许：

SELECT x.thing FROM
(
    SELECT thing FROM dbo.Table1
    UNION ALL
    SELECT thing FROM dbo.Table2
) X
GROUP BY x.thing
Having Count(*) = 1

Demo

但是，这也将删除其表中可能需要或可能不需要的重复项。

Answer 2

你有没有尝试过这样的事情：

delete form X
where (car  = 
    Select distinct car
    from X 
    where x);

distinct--> 返回不同的值。

Answer 3

试试这个：

declare @table1 table (col1 varchar(max))
declare @table2 table (col1 varchar(max))

insert into @table1 values
('book'),('pen'),('pencil'),('bag')

insert into @table2 values ('car'),('van'),('book'),('bike'),('pencil') 

;with cte
as (
select COUNT(1) as total_item, col1 from (
select col1 from @table1
union all 
select col1 from @table2
)a group by col1
)

select  col1 from cte  where total_item = 1 

Answer 4

    WITH uniontables AS  (
  SELECT    NULL AS car,
            NULL AS van,
            book,
            NULL AS bike,
            pen,
            pencil,
            bag 
  FROM      [Table 1 ]
  UNION 
  SELECT    car,
            van,
            book,
            bike,
            NULL AS pen,
            pencil,
            NULL AS bag 
  FROM [Table 2 ] )

  SELECT DISTINCT * FROM uniontables